4.8. To add your control training CSV file to the study, click on the 'Choose File' button next to the 'Control Samples File' label.
The filename of the mapping file we just uploaded now appears next to the 'Choose File' button for 'Subject to Sample Mapping File' (highlighted in red). Now click on the 'Choose File' button next to 'Control Samples File' (highlighted in blue) to begin uploading your control training file.
